A denial is not the end of your case. Many denials can be challenged, but deadlines matter, so act quickly and keep everything in writing. This guide is general information only — see the Disclaimer.
En español: Reclamo negado en Illinois: qué hacer ahora
1. Get the denial in writing
Ask for the exact reason for the denial, in writing: Was the injury disputed, was notice late, was treatment not authorized, or was the claim filed late? Keep the letter, the date you received it, and any claim number — but do not put a claim number in a form on this site.
2. Check the deadlines
Illinois generally allows filing a claim with the IWCC within 3 years of the injury, or within 2 years of the last workers’ compensation payment, whichever is later — a general, most-cited figure. Verify your own deadline against the current IWCC handbook, because your injury date and payment history control it. Do not wait until a deadline is close.
3. Gather your evidence
- Your written injury report and proof you sent it.
- Medical records showing the injury and treatment.
- Witness names and statements.
- Pay records and time missed.
4. Get help early
Denials involving disputed causation, late notice, an IME, or utilization review are often where a lawyer’s advice matters most. Use Connect with a lawyer to request contact — this site is not a law firm, does not give legal advice, and does not promise an outcome. The lawyer will discuss any fee directly with you.
5. Common reasons for a denial
Most denial letters point to one of a few reasons: the insurer says it did not receive notice of the injury in time, the injury was not reported in writing, the injury was not caused by work, a pre-existing condition is the cause, or the treatment was not authorized. The reason matters, because each one points to a different next step. If the letter is vague or gives no reason at all, ask for the reason in writing before you decide what to do.
6. If the insurer says work did not cause the injury
A common denial is that work did not cause the injury, or that a pre-existing condition is the real cause. A work event can aggravate an old problem, and that worsening can be compensable. Tell your doctor about both the prior condition and what changed after work, and keep earlier and current medical records so the dates and changes are clear. Read Can I get benefits for a pre-existing condition?
7. If the claim stays stalled
If a denial leaves the claim stalled — benefits stop, treatment is not authorized, or nothing moves for weeks — a 19(b) hearing can be the way to ask for a decision. Read What is a 19(b) hearing, and when does a stalled claim need one? If a claim was denied or closed and your facts change, read Can I reopen a workers’ compensation claim in Illinois?
Verify against the IWCC: Denial reasons and filing deadlines depend on the letter you received and the facts of your case. Check current guidance with the Illinois Workers’ Compensation Commission, and act well before any deadline.
This page is general information only. It is not medical advice, not legal advice, and this site is not a law firm. See the Disclaimer.
Related: IME and utilization review, Physical therapy, What is a 19(b) hearing, Can I reopen a claim, FAQs.
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